Abstract
Lifespan extension is an all systems encompassing event. Involvement of reduced insulin/IGF1 signalling is well worked out, first in the model organism Caenorhbaditis elegans followed by other systems including humans. But the role of neuronal component in lifespan extension is not well understood due to the refractory nature of neurons to small RNA interference (sRNAi) in C. elegans. Earlier, we have demonstrated that an antihypertensive drug, reserpine, extends lifespan through modulation of neurotransmitter release, especially, acetylcholine, in C. elegans. Intriguingly, the reserpine mediated lifespan extension (RMLE) does not happen through the known longevity pathways. Here, we report that the D2-type dopamine receptor (DOP-3), which acts through the inhibitory G-protein coupled (Gαi) pathway mediated signalling is partly required for RMLE. In the dop-3 loss of function mutant RMLE is shortened. DOP-3 acts through Gαo (goa-1). One of the downstream targets of G protein signalling is the transcription factor, jun-1. MRP-1, an ATP binding cassette transporter, belonging to the multidrug resistance protein family is one of the genes turned on by JUN-1. RMLE is shortened in dop-3→goa-1→jun1→mrp-1 loss of function mutants, elucidating the contribution of dop-3 signalling. The dop-3 receptor system is known to inhibit acetylcholine release. This suggests dopamine receptor, dop-3 could be contributing to the modulation of acetylcholine release by reserpine. ERI-1 is a 3′-5′ exoribonuclease, one of the negative regulators of sRNAi, whose loss of function makes neurons amenable to siRNA. In the absence of eri-1, RMLE is shortened. In the dop-3 loss-of-function background, lack of eri-1 completely abolishes RMLE. This suggests that dop-3 and eri-1 act in independent parallel pathways for RMLE and these two pathways are essential and sufficient for the longevity enhancement by reserpine in C. elegans.
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Acknowledgements
The authors are grateful to Prof K Subramaniam, Indian Institute of Technology, Kanpur & Chennai, India, for the technical help and suggestions. The authors gratefully acknowledge the financial support from Department of Biotechnology, India, and the Caenorhabditis Genetics Center supported by National Institute of Health, USA, and the Gene Knockout Consortium, British Columbia for the C. elegans strains.
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Corresponding editor: Subhash C Lakhotia
[Saharia K, Kumar R, Gupta K, Mishra S and Subramaniam JR 2016 Reserpine requires the D2-type receptor, dop-3, and the exoribonuclease, eri-1, to extend the lifespan in C. elegans. J. Biosci.]
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Saharia, K., Kumar, R., Gupta, K. et al. Reserpine requires the D2-type receptor, dop-3, and the exoribonuclease, eri-1, to extend the lifespan in C. elegans . J Biosci 41, 689–695 (2016). https://doi.org/10.1007/s12038-016-9652-7
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DOI: https://doi.org/10.1007/s12038-016-9652-7